You are talking about forming your own micronation and as other similar experiments have shown before, this is bound to fail, if you want to be free and lay low I cannot think of a worst way to do it than this, by doing this you will immediately become a target of every single country of the world, after all forming a country is not something that happens in such arbitrary fashion, and even if you think you got all your bases covered and you think you can do it there is nothing stopping the governments to change those same laws and regulations to give themselves permission to appropriate any land you happen to bring to the surface.